Create Readonly Dict from Langext map

lang_ext.csproj

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net5.0</TargetFramework>
    <RootNamespace>lang_ext</RootNamespace>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="LanguageExt.Core" Version="3.4.15" />
  </ItemGroup>

</Project>

Program.cs

using System;
using System.Collections.Generic;
using System.Linq;

using LanguageExt;
using static LanguageExt.Prelude;

namespace lang_ext
{
    class Program
    {
        static void Main(string[] args)
        {
            var demo = new Demo<int>(new List<int>(){100,200});
            var dict2 = demo.toDict3();
            string text2 = dict2.Select(kvp => kvp.ToString()).Aggregate((a, b) => a + ", " + b);
            Console.WriteLine(text2); 
        }
    }

    public class Demo<T> {
      private T token;
      private T lifetime;

      public Demo(List<T> param){
        token = param[0];
        lifetime = param[1];
      }

      public IReadOnlyDictionary<string,T> toDict3() => Map(
        (nameof(token),token),
        (nameof(lifetime),lifetime)).ToDictionary();
    }
}